TY - JOUR
T1 - The anisotropic effect of hexagonal warping on the transport
AU - Wu, Mei Mei
AU - Yu, Zhi Ming
AU - Pan, Hui
N1 - Publisher Copyright:
© 2018 Elsevier B.V.
PY - 2019/1/12
Y1 - 2019/1/12
N2 - In the presence of hexagonal warping (HW), the surface state of a topological insulator (TI) exhibits anisotropic Fermi surface. In this work, we study the transport properties of a TI junction, focusing on the influence of anisotropic effect of the HW on the scattering. We establish general expressions for calculating the scattering with an arbitrary angle between TI surface and the potential step, and find that the transmission probability and conductance have a strong dependence on the angle, making TI junction a promising platform for studying the geometry control of transport. Remarkably, we find that the HW can induce a triple refraction, which gives rise to an anomalous increase of the transmission probability when varying incident angle. The general expressions here for calculating the scattering can be extended to the systems with trigonally and tetragonally warped Fermi surface.
AB - In the presence of hexagonal warping (HW), the surface state of a topological insulator (TI) exhibits anisotropic Fermi surface. In this work, we study the transport properties of a TI junction, focusing on the influence of anisotropic effect of the HW on the scattering. We establish general expressions for calculating the scattering with an arbitrary angle between TI surface and the potential step, and find that the transmission probability and conductance have a strong dependence on the angle, making TI junction a promising platform for studying the geometry control of transport. Remarkably, we find that the HW can induce a triple refraction, which gives rise to an anomalous increase of the transmission probability when varying incident angle. The general expressions here for calculating the scattering can be extended to the systems with trigonally and tetragonally warped Fermi surface.
KW - Anisotropic effect
KW - Topological insulator
KW - Transport
UR - http://www.scopus.com/inward/record.url?scp=85055522420&partnerID=8YFLogxK
U2 - 10.1016/j.physleta.2018.10.017
DO - 10.1016/j.physleta.2018.10.017
M3 - Article
AN - SCOPUS:85055522420
SN - 0375-9601
VL - 383
SP - 237
EP - 242
JO - Physics Letters, Section A: General, Atomic and Solid State Physics
JF - Physics Letters, Section A: General, Atomic and Solid State Physics
IS - 2-3
ER -